échangeur de cations

OBS: L'expression résine échangeuse de cations peut être utilisée dans le cas de polymères organiques solides.

OBS: The term cation-exchanger resin may be used in the case of solid organic polymers.
OBS: The early cation exchangers were naturally occurring zeolites but these have been almost completely superseded by the synthetic organic ion exchangers. The synthetic cation exchangers are classified into two main groups, the weak cation exchangers and the strong cation exchanger. In the former the main functional groups are carboxylic acid groups and in the latter they are sulphonic acid groups.